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Condition: This is an Antlia ALP-T 2" Dual Narrowband (5nm) filter in excellent condition. The optics are clean, the body is unmarked. There is no indication anywhere as to whether this is the highspeed (f/2.2 to f/4) or slower version (f/3.6 and higher). However, the previous owner used it at f/7 on his EdgeHD SCT scopes.
Comes in its original jewel box and cardboard box, with its original scan report.
Antlia Quadband ALP-T Dual Narrowband 5nm Filter
The Antlia ALP-T dual band 5nm series filter is a dual line-pass filter that was designed to be used primarily with one-shot color (OSC) cameras such as DSLR's and astronomical OSC cameras. It can also be used as a narrowband filter for monochrome cameras to save imaging time. The advanced multi-coatings on our ALP-T ultra dual band filter effectively isolate the red Ha and the blue-green OIII lines light from emission nebulae, with almost total suppression of optical density (OD) 4.5 on unwanted wavelengths from light pollution, moonlight, and airglow. The result is that our ALP-T dual band 5nm filter creates a superior signal-to-noise ratio and better contrast in your images.
The filter enables the capture of the two main emission nebulae bands at the same time, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.
Worth mentioning is that Antlia inspected and measured products piece by piece with one of Agilent Cary’s professional spectrophotometer, resolution/slit width is up to 0.2nm, which make us provide highly reliable and consistent products to you.
Application and Performance:
- Engineered specifically for use with DSLR, CMOS, and CCD color cameras
- Suppression of optical density (OD) 4.5 on unwanted wavelengths adds signal-to-noise
- Extremely steep bandpass edges minimize internal reflections
- Ideal flat-top and moderate bandpass reducing spectrum down shifts
- Ion Gun Assisted Deposition coating technology on the double-sided polished substrate making it the most consistent and accurate light pollution suppression filter
- Designed to suppress artificial lighting from Bortle scale 1 to Bortle scale 8
- Near IR (NIR) is blocked up to 1050nm
Technical Data:
Hydrogen-alpha
- FWHM: 5nm
- CWL (Central Wavelength): 657.8nm
- Peak Transmission: 88%
- Blocking: ≥OD4.5 @ 300-1050nm
- Filter Thickness: 2mm+/-0.05mm
Oxygen III
- FWHM: 5nm
- CWL (Central Wavelength): 502.2nm
- Peak Transmission: 82%
- Blocking: ≥OD4.5 @ 300-1050nm
- Filter Thickness: 2mm+/-0.05mm
Filter Ring:
- 2’’ Mounted (M48*0.75 thread)
- Ultra-thin filter cell to minimize vignetting by maximizing possible clear aperture
- Black Anodized Finish
- Laser Engraving, No Fading
Not Recommended:
- Solar Observing and imaging
- Night visual observation
- DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will result if you fail to observe the warning.